Open-source compact microcontroller core with a 4-stage in-order pipeline for deeply embedded applications

SCR1 is an open-source and silicon-proven RISC-V-compatible, 32-bit, entry-level, MCU-class core. It targets general-purpose, deeply embedded applications and control systems.

SCR1 supports RISC-V standard "I" Integer, "E" Reduced Base Integer, "M" Integer Multiplication and Division, and "C" 16-bit Compressed extensions. SCR1 is equipped with an in-order 4-stage pipeline, a TCM unit, an IPIC unit for efficient interrupt processing, as well as industry-standard AXI4, AHB-Lite, and JTAG/cJTAG interfaces for flexibility and compatibility.

The core is open-sourced under the permissive SHL license, comes with pre-configured software tools, and is ready out-of-the-box for commercial and educational purposes.

SCR1 Key Features

Development Tools

Syntacore Development Toolkit (SCR1 Optimized)

The SC-DT package is a ready-to-use software development kit containing pre-built and pre-configured tools that simplify software development for the SCR1 core. With SC-DT, you can take advantage of the pre-built tools and configurations to reduce the time and effort required to get up and running with SCR1. SC-DT supports Windows and Linux operating systems and includes:

• Eclipse IDE and Visual Studio Code plugin
• Compilers (GCC, LLVM) with optimized libraries
• Debuggers (GDB, OCD)
• Simulator (QEMU)
• FreeRTOS
• BSP and HAL
• Application examples
• Benchmarks
• Documentation

Syntacore also supports and maintains the Zephyr operating system that is not part of the SC-DT package and is downloadable separately.

• Internet of things
• Smart cards
• Control systems
• Sensors
• Smart home
• Education programs

SCR1 is available out-of-the-box, configurable, written in SystemVerilog and comes with a full set of pre-built, tested, and optimized development tools, system software, pre-configured FPGA-based SDK and complete documentation. The software package includes ready-to-use toolchains, IDEs, operating systems, bootloaders, debuggers, simulators, and sample projects that reduce the time and effort required to get up and running with SCR1.

The SCR1 product package includes:

• RISC-V-compatible Core
  • System Verilog RTL source code
• Syntacore Development Toolkit (downloaded separately)
  • Toolchains
  • OS and bootloaders
  • IDEs
  • Debuggers
  • Simulator
  • Software example projects, HAL (Boards support package)
• FPGA-based SDK
  • Sample FPGA projects
  • Pre-build FPGA images
• Tests and Scripts for Simulation
  • Verification test suite for pre-silicon (RTL simulation-based)
  • Verilator simulation support
• Comprehensive Documentation
  • User Manual (quick start guide)
  • External Architecture Specification (EAS)
  • SDK User Guide
  • Tools Guide